我有两个视图控制器。CardWallet View Controller 是我的表格视图。然后 AddCard 视图控制器是我为名为 Card 的对象的新实例输入值的地方。到目前为止，我正在使用委托将这些 Card 实例添加到名为 myWallet 的数组中，该数组位于我的 CardWallet 视图控制器中，并且它可以工作。
我想要的是，在我的 AddCard View Controller 中单击按钮后，我的 Card Wallet 视图中将出现一个新的表格单元格，其名称取决于最近添加的 Card 实例。下面是我的代码，请检查为什么当我添加完一个新的 Card 实例后，我的表中没有出现任何内容。我做了一些研究并阅读了一些教程，这个很好， http: //kurrytran.blogspot.com/2011/10/ios-5-storyboard-and.html，它对我有很多关于表格视图控制器的帮助. 但是，本教程并没有满足我的主要关注点，因为它的表值仅来自具有静态值的数组。
谢谢！
CardWalletViewController.h
#import <UIKit/UIKit.h>
@interface CardWalletViewController : UIViewController <UITableViewDelegate, UITableViewDataSource> {
}
@property (nonatomic, strong) NSMutableArray *myWallet;
-(void) printArrayContents;
@end
CardWalletViewController.m
#import "CardWalletViewController.h"
#import "AddCardViewController.h"
#import "Card.h"
@interface CardWalletViewController () <AddCardDelegate>
@end
@implementation CardWalletViewController
@synthesize myWallet = _myWallet;
- (NSMutableArray *) myWallet
{
if (_myWallet == nil) _myWallet = [[NSMutableArray alloc] init];
return _myWallet;
}
- (void)prepareForSegue:(UIStoryboardSegue *)segue sender:(id)sender
{
if ([segue.identifier isEqualToString:@"showAddCardVC"]) {
AddCardViewController *addCardVC = (AddCardViewController *)segue.destinationViewController;
addCardVC.delegate = self;
}
}
- (void)printArrayContents
{
// I want to show the name of each instance of card
for ( int i = 0; i < self.myWallet.count; i++) {
Card *cardDummy = [self.myWallet objectAtIndex:i];
NSLog(@"Element %i is %@", i,cardDummy.name );
}
}
- (void)addCardViewController:(AddCardViewController *)sender didCreateCard:(Card *)newCard
{
// insert a new card to the array
[self.myWallet addObject:newCard];
[self printArrayContents];
}
- (void)viewDidLoad
{
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
// Release any retained subviews of the main view.
}
- (void)viewWillAppear:(BOOL)animated
{
}
- (void)viewWillDisappear:(BOOL)animated
{
}
- (NSInteger)tableView:(UITableView *)tableView numberOfRowsInSection:(NSInteger)section {
//this method will return the number of rows to be shown
return self.myWallet.count;
}
- (UITableViewCell *)tableView:(UITableView *)tableView cellForRowAtIndexPath:(NSIndexPath *)indexPath
{
NSString *CellIdentifier = @"Cell";
UITableViewCell *cell = (UITableViewCell *) [tableView dequeueReusableCellWithIdentifier:CellIdentifier];
if (cell == nil) {
cell = [[UITableViewCell alloc] initWithStyle:UITableViewCellStyleSubtitle reuseIdentifier:CellIdentifier];
}
// Configure the cell...
//---------- CELL BACKGROUND IMAGE -----------------------------
UIImageView *imageView = [[UIImageView alloc] initWithFrame:cell.frame];
UIImage *image = [UIImage imageNamed:@"LightGrey.png"];
imageView.image = image;
cell.backgroundView = imageView;
[[cell textLabel] setBackgroundColor:[UIColor clearColor]];
[[cell detailTextLabel] setBackgroundColor:[UIColor clearColor]];
//this will show the name of the card instances stored in the array
//
for ( int i = 0; i < self.myWallet.count; i++) {
Card *cardDummy = [self.myWallet objectAtIndex:i];
cell.textLabel.text = cardDummy.name;
}
//Arrow
cell.accessoryType = UITableViewCellAccessoryDisclosureIndicator;
return cell;
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation != UIInterfaceOrientationPortraitUpsideDown);
}
@end
AddCardViewController.h
#import <UIKit/UIKit.h>
#import "Card.h"
@class AddCardViewController;
@protocol AddCardDelegate <NSObject>
- (void)addCardViewController:(AddCardViewController *)sender
didCreateCard:(Card *) newCard;
@end
@interface AddCardViewController : UIViewController <UITextFieldDelegate>
@property (strong, nonatomic) IBOutlet UITextField *cardNameTextField;
@property (strong, nonatomic) IBOutlet UITextField *pinTextField;
@property (strong, nonatomic) IBOutlet UITextField *pointsTextField;
@property (nonatomic, strong) id <AddCardDelegate> delegate;
@end
AddCardViewController.m
#import "AddCardViewController.h"
#import "Card.h"
#import "CardWalletViewController.h"
@interface AddCardViewController ()
@end
@implementation AddCardViewController
@synthesize cardNameTextField = _cardNameTextField;
@synthesize pinTextField = _pinTextField;
@synthesize pointsTextField = _pointsTextField;
@synthesize delegate = _delegate;
- (id)initWithNibName:(NSString *)nibNameOrNil bundle:(NSBundle *)nibBundleOrNil
{
self = [super initWithNibName:nibNameOrNil bundle:nibBundleOrNil];
if (self) {
// Custom initialization
}
return self;
}
- (void) viewWillAppear:(BOOL)animated
{
[super viewWillAppear:animated];
[self.cardNameTextField becomeFirstResponder];
}
- (void) viewWillDisappear:(BOOL)animated
{
}
- (BOOL) textFieldShouldReturn:(UITextField *)textField{
if ([textField.text length]) {
[self.cardNameTextField resignFirstResponder];
[self.pinTextField resignFirstResponder];
[self.pointsTextField resignFirstResponder];
return YES;
}
else {
return NO;
}
}
- (void)viewDidLoad
{
self.cardNameTextField.delegate = self;
self.pinTextField.delegate = self;
self.pointsTextField.delegate = self;
[super viewDidLoad];
// Do any additional setup after loading the view, typically from a nib.
}
- (void)viewDidUnload
{
[self setCardNameTextField:nil];
[self setPinTextField:nil];
[self setPointsTextField:nil];
[super viewDidUnload];
// Release any retained subviews of the main view.
}
- (BOOL)shouldAutorotateToInterfaceOrientation:(UIInterfaceOrientation)interfaceOrientation
{
return (interfaceOrientation == UIInterfaceOrientationPortrait);
}
- (IBAction)addCard:(id)sender
{
Card *myNewCard = [[Card alloc] init];
myNewCard.name = self.cardNameTextField.text;
myNewCard.pin = self.pinTextField.text;
myNewCard.points = [self.pointsTextField.text intValue];
// to check if the text fields were filled up by the user
if ([self.cardNameTextField.text length] && [self.pinTextField.text length] && [self.pointsTextField.text length])
{
[[self presentingViewController] dismissModalViewControllerAnimated:YES];
NSLog(@"name saved %@", myNewCard.name);
NSLog(@"pin saved %@", myNewCard.pin);
NSLog(@"points saved %i", myNewCard.points);
[self.delegate addCardViewController:self didCreateCard:myNewCard];
// to check if there is a delegate
if (self.delegate){
NSLog(@"delegate is not nil");
}
}
}
@end
卡片.h
#import <Foundation/Foundation.h>
@interface Card : NSObject
@property (nonatomic, strong) NSString *name;
@property (nonatomic, strong) NSString *pin;
@property (nonatomic) int points;
@end
卡.m
#import "Card.h"
@implementation Card
@synthesize name = _name;
@synthesize pin = _pin;
@synthesize points = _points;
@end